Recently I came to a nicely done blog by SevenSins (sevensinsca.blogspot.com.au/2012/06/seven-sins-vs-elite-owls.html) which gave me this idea.
Since the festival guild battle is 4 times a day, we can note who are the actives for that particular time slot battle.
So rather then waiting for the active to appear, we can Whack the Regular Active before they Act.
It will be like mind reading them, sounds Fun and I think this is a good strategy we can work on.
So when we battle (eg. GOW @UTC 0200 time) we can look at who are the active and this gives us added advantage to know who is the Regular Active enemies.